#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>

int main(void) {
    char str[8001] = { 0 };

    scanf("%s", str);
    char* p = str;
    long long int c = 0, ch = 0, chn = 0;
    while (*p) {
        if (*p == 'C') {
            c++;
        }
        else if (*p == 'H') {
            ch += c;
        }
        else if (*p == 'N') {
            chn += ch;
        }
        p++;
    }
    printf("%lld", chn);
    return 0;
}





